Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 3e4f2027 authored by Liam Mark's avatar Liam Mark Committed by Gerrit - the friendly Code Review server
Browse files

iommu/arm-smmu: ref count clocks and regulators 



Use reference counting when enabling and disabling clocks and
regulators in order to improve performance.

Change-Id: I89a3eec17fd551f0625da8a504634f0df311d64f
Signed-off-by: default avatarLiam Mark <lmark@codeaurora.org>
parent a28dc2cc

drivers/iommu/arm-smmu.c

+13 −0
Original line number Diff line number Diff line
@@ -386,6 +386,8 @@ struct arm_smmu_device { 
	unsigned int			num_impl_def_attach_registers;



	struct mutex			atos_lock;

	atomic_t			clock_refs_count;

	atomic_t			regulator_refs_count;

};



struct arm_smmu_cfg {
@@ -699,6 +701,9 @@ static int arm_smmu_disable_regulators(struct arm_smmu_device *smmu) 
	if (!smmu->gdsc)

		return 0;



	if (atomic_dec_return(&smmu->regulator_refs_count) > 0)

		return 0;



	arm_smmu_unprepare_clocks(smmu);

	return regulator_disable(smmu->gdsc);

}
@@ -710,6 +715,9 @@ static int arm_smmu_enable_regulators(struct arm_smmu_device *smmu) 
	if (!smmu->gdsc)

		return 0;



	if (atomic_inc_return(&smmu->regulator_refs_count) > 1)

		return 0;



	ret = regulator_enable(smmu->gdsc);

	if (ret)

		return ret;
@@ -745,6 +753,9 @@ static int arm_smmu_enable_clocks_atomic(struct arm_smmu_device *smmu) 
{

	int i, ret = 0;



	if (atomic_inc_return(&smmu->clock_refs_count) > 1)

		return 0;



	for (i = 0; i < smmu->num_clocks; ++i) {

		ret = clk_enable(smmu->clocks[i]);

		if (ret) {
@@ -761,6 +772,8 @@ static int arm_smmu_enable_clocks_atomic(struct arm_smmu_device *smmu) 
static void arm_smmu_disable_clocks_atomic(struct arm_smmu_device *smmu)

{

	int i;

	if (atomic_dec_return(&smmu->clock_refs_count) > 0)

		return;



	for (i = 0; i < smmu->num_clocks; ++i)

		clk_disable(smmu->clocks[i]);